src/third_party/skia/src/gpu/gl/angle/SkANGLEGLContext.cpp

   1
   2 /*
   3  * Copyright 2012 Google Inc.
   4  *
   5  * Use of this source code is governed by a BSD-style license that can be
   6  * found in the LICENSE file.
   7  */
   8
   9 #include "gl/SkANGLEGLContext.h"
  10
  11 SkANGLEGLContext::SkANGLEGLContext()
  12     : fContext(EGL_NO_CONTEXT)
  13     , fDisplay(EGL_NO_DISPLAY)
  14     , fSurface(EGL_NO_SURFACE) {
  15     fDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY);
  16
  17     EGLint majorVersion;
  18     EGLint minorVersion;
  19     eglInitialize(fDisplay, &majorVersion, &minorVersion);
  20
  21     EGLint numConfigs;
  22     static const EGLint configAttribs[] = {
  23         EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
  24         EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
  25         EGL_RED_SIZE, 8,
  26         EGL_GREEN_SIZE, 8,
  27         EGL_BLUE_SIZE, 8,
  28         EGL_ALPHA_SIZE, 8,
  29         EGL_NONE
  30     };
  31
  32     EGLConfig surfaceConfig;
  33     eglChooseConfig(fDisplay, configAttribs, &surfaceConfig, 1, &numConfigs);
  34
  35     static const EGLint contextAttribs[] = {
  36         EGL_CONTEXT_CLIENT_VERSION, 2,
  37         EGL_NONE
  38     };
  39     fContext = eglCreateContext(fDisplay, surfaceConfig, NULL, contextAttribs);
  40
  41
  42     static const EGLint surfaceAttribs[] = {
  43             EGL_WIDTH, 1,
  44             EGL_HEIGHT, 1,
  45             EGL_NONE
  46         };
  47     fSurface = eglCreatePbufferSurface(fDisplay, surfaceConfig, surfaceAttribs);
  48
  49     eglMakeCurrent(fDisplay, fSurface, fSurface, fContext);
  50
  51     fGL.reset(GrGLCreateANGLEInterface());
  52     if (NULL == fGL.get()) {
  53         SkDebugf("Could not create ANGLE GL interface!\n");
  54         this->destroyGLContext();
  55         return;
  56     }
  57     if (!fGL->validate()) {
  58         SkDebugf("Could not validate ANGLE GL interface!\n");
  59         this->destroyGLContext();
  60         return;
  61     }
  62 }
  63
  64 SkANGLEGLContext::~SkANGLEGLContext() {
  65     this->destroyGLContext();
  66 }
  67
  68 void SkANGLEGLContext::destroyGLContext() {
  69     fGL.reset(NULL);
  70     if (fDisplay) {
  71         eglMakeCurrent(fDisplay, 0, 0, 0);
  72
  73         if (fContext) {
  74             eglDestroyContext(fDisplay, fContext);
  75             fContext = EGL_NO_CONTEXT;
  76         }
  77
  78         if (fSurface) {
  79             eglDestroySurface(fDisplay, fSurface);
  80             fSurface = EGL_NO_SURFACE;
  81         }
  82
  83         //TODO should we close the display?
  84         fDisplay = EGL_NO_DISPLAY;
  85     }
  86 }
  87
  88 void SkANGLEGLContext::makeCurrent() const {
  89     if (!eglMakeCurrent(fDisplay, fSurface, fSurface, fContext)) {
  90         SkDebugf("Could not set the context.\n");
  91     }
  92 }
  93
  94 void SkANGLEGLContext::swapBuffers() const {
  95     if (!eglSwapBuffers(fDisplay, fSurface)) {
  96         SkDebugf("Could not complete eglSwapBuffers.\n");
  97     }
  98 }